It should tell you on the presctiption bottles. Unless you don't have a prescription for it and in that case, you shouldn't even be taking it. Why would you even be asking this question? Just curious...

They're asking because each manufacturer's fillers change the effect for people. What works for one doesn't mean it works for another.OP, were you asking about the same milligram but different color/manufacturer? I have noticed (for 30mg) that the orange one made me very talkative and scattered. The pink one works great for my ADHD. It helps me to focus better by allowing me to ignore unwanted chatter and organize as I go along. Hope this helps!